<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<div class="box1">
			
		</div>
	</body>
</html>
<style type="text/css">
	.box1{
		width: 0;
		border: 100px solid;
		border-top:none ;
		border-color: transparent transparent #FFFF00 transparent; 
	}
</style>
